1356638220 has 120 divisors (see below), whose sum is σ = 4863839904. Its totient is φ = 310086144.

The previous prime is 1356638203. The next prime is 1356638243. The reversal of 1356638220 is 228366531.

It is a happy number.

1356638220 is a `hidden beast` number, since 13 + 5 + 6 + 638 + 2 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48477 + ... + 71156.

Almost surely, 2^1356638220 is an apocalyptic number.

1356638220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1356638220 is an abundant number, since it is smaller than the sum of its proper divisors (3507201684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1356638220 is a wasteful number, since it uses less digits than its factorization.

1356638220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119661 (or 119650 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1356638220 is about 36832.5700976731. The cubic root of 1356638220 is about 1107.0180004564.

The spelling of 1356638220 in words is "one billion, three hundred fifty-six million, six hundred thirty-eight thousand, two hundred twenty".